Replied by mail message, but it could be useful at forum.
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MFC needs different naming for output resource files.
Try to rename Dll to TestFRA.dll.
You can read details about automatic loading at
https://msdn.microsoft.com/en-us/library/8fkteez0.aspx

You can change output naming in Lingobit Localizer at Project > Properties > Win32 > MFC Output. Select
Edit for output file name pattern and use $(LangAbbr) macro.

If it doesn't work, it is better to debug MFC and check what stops
language DLL from loading.